How to define the radius of a corner?

[Manu3790]

Hi folks,
I'm not really experienced in Inkscape, but I want to improve my skills. I'm struggling with a pretty simple thing. I try to make it as easy as possible, how do I define the radius of a corner?
For example like shown in the picture attached.

When I work with the corner options for squares its hard to always move the point marker so that I get the same radius every time I want it.

I would be really thankful if someone could show me how to do that.
Thanks!

[Moini]

You can't in current Inkscape, unless you use rectangles, which do have rounded corners with x/y radius available. It's possible to cut the rectangles after adding the corner, and to reuse the rounded corners in your drawing.

A future version of Inkscape (0.93) will contain a path effect that can help with this.